The Question:

Why do cats always land on their feet?

The Answer:

Most cats can get their
feet underneath them during a fall because of their unique skeleton
structure and agility. Cats do not have a collarbone and the bones in
their backbone have more flexibility than other animals. This makes
bending and rotating their bodies easier during a short fall.

A fall of two or more floors, however, can seriously injure a
cat. The impact of a fall from that distance or greater usually can't
be sufficiently absorbed by the cat's feet and legs. This might cause
the cat's head to hit the ground or serious internal injuries.

And keep in mind that any fall can hurt an animal. So make sure
windows are properly screened and access to balconies and elevated
porches is limited.